. The logic is now ready to handle a current reversal without tripping. The
output signal IRVL will be connected to the block input on the permissive overreaching
scheme.
When the fault current is reversed on the healthy line, IRV is deactivated and IRVBLK is
activated. The
tDelayRev
timer delays the reset of the output signal. The signal blocks
operation of the overreach permissive scheme for residual current and thus prevents
unwanted operation caused by fault current reversal.
tPickUp
Rev
AND
tDelay
Rev
BLOCK
IREV
IRWD
IRVL
tPickUp
Rev
ANSI09000031-2-en.vsd
0
0
10ms
0
0
CurrRev = On
ANSI09000031 V2 EN
Figure 249:
Simplified logic diagram for current reversal
12.6.6.3
Weak-end infeed logic
The weak-end infeed function can be set to send only an echo signal (
WEI=Echo
) or an
echo signal and a trip signal (
WEI=Echo & Trip
and figure
The weak-end infeed logic uses normally a reverse and a forward direction element,
connected to WEIBLK1 via an OR-gate. See figure
. If neither the forward nor the
reverse directional measuring element is activated during the last 200 ms, the weak-end
infeed logic echoes back the received permissive signal. See figure
If the forward or the reverse directional measuring element is activated during the last 200
ms, the fault current is sufficient for the IED to detect the fault with the ground-fault
function that is in operation.
AND
&
CRL
WEIBLK1
BLOCK
ECHO
WEI = Echo
ANSI09000032-2-en.vsd
0
200 ms
50 ms
0
0
200 ms
0
tPickUpWEI
ANSI09000032 V2 EN
Figure 250:
Simplified logic diagram, weak-end infeed - Echo
Section 12
1MRK 506 335-UUS A
Scheme communication
526
Technical manual
Содержание REL650 series
Страница 1: ...Relion 650 series Line distance protection REL650 ANSI Technical manual ...
Страница 2: ......
Страница 42: ...36 ...
Страница 48: ...42 ...
Страница 58: ...52 ...
Страница 68: ...62 ...
Страница 74: ...68 ...
Страница 194: ...188 ...
Страница 534: ...528 ...
Страница 580: ...574 ...
Страница 722: ...716 ...
Страница 792: ...786 ...
Страница 855: ...849 ...